HYALINOECIA LEUCACRA. 317 



projecting in the direction of the axis of the shaft instead of at a distinct angle 

 with it, as more usual. This is a characteristic of Moore's H. tubicola stricta, 

 dredged from off San Diego, Cal.; but in the present series of specimens this 

 character is variable and is not correlated with a difference in the jaws as given 

 for stricta. Many of the specimens have the setae of strictly typical form. In 

 regard to the jaws it may be said that the specimens agree with the typical At- 

 lantic form, the teeth of maxillae II, left outer plate, being mostly thirteen 

 with sixteen as the maximum noted and twelve as the minimum. No individ- 

 uals showed the high numbers occurring in stricta, namely eighteen for the left 

 outer plate II and seventeen for the right. 



This species as now known has an exceedingly wide range, having previously 

 been recorded from various parts of the North Atlantic off both the American 

 and European coasts, and from the Mediterranean, Canary Islands, Azores, 

 West Indies, off Brazil, New Zealand, Torres Strait, Japan, East Indies, and 

 Africa. 



Hyalinoecia LEUCACRA, sp. nov.^ 

 Plate 37, fig. 9, 10; Plate 38, fig. 1-3. 



Two incomplete specimens are in such poor state of preservation that a 

 complete account cannot be given. This is a slender form having a maximum 

 diameter of about 2 mm., exclusive of the parapodia. 



The median and posterior paired tentacles, which are broken off at the tips 

 in one and absent from the other, seem to be of nearly equal size, the anterior 

 paired tentacles being very much shorter. The ceratophores are long and 

 relatively slender, though clearly stouter than the styles. Each is rather weakly 

 annulate, the annuli long. 



The peristomium is much shorter and narrower than somite II, its length 

 in the type being less than one half that of the latter somite. 



The anterior pairs of parapodia are longer than usual, the first pair in particu- 

 lar being conspicuously so and extending almost directly forwards much beyond 

 the anterior end of the prostomium. 



The setae of the first parapodia are very numerous and closely crowded. 

 They are much stouter than those of the posterior somites, dark-colored, aciculi- 

 form, curved distally, and at distal end with two blunt lobes or teeth with guards. 

 (Plate 38, fig. 2). Acicula ending abruptly in very fine, transparent tips equal- 



XeuK^s, white, SiKpa, tip. 



